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12
Electrical
Electrical Connection / Requirements
The electrical connection for the ABH is on the bottom of the unit. There is a 1/2” knockout location for an electrical connection for
the heater’s incoming power connection. All electrical wiring must be performed by a qualified licensed electrician in accordance
with National Electrical Code ANSI/NFPA and/or the Canadian Electrical Code, Part 1 CSA C22.1, or to any applicable local codes and
standards. For your convenience, all the points for electrical connections needed to operate the ABH are labeled.
NOTE: Always check electrical ground to known earth ground; if less than 0.5 ohms, ground is sufficient (meter MUST be on
lowest setting).
We recommend a simplified test, differing from one looking for building earth ground issues, it is our intent to use this test as an
indicator of equipment room (boiler or water heater) electrical grounding issues, or equipment bonding issues, not prove the earth
ground to the building.
Take an Ohm meter and place one lead on a known earth ground (not the ground wire on the boiler), and place the other lead on
either 1) The near boiler system piping, 2) The boiler heat exchanger, or 3) The boiler cabinet.
If any of those readings exceed 0.5 Ohms, then it is a good indicator that there may be sufficient stray current flowing through the
water in the piping system to accelerate or amplify conditions that can cause pump, boiler or piping issues in the not too distant
future.
If any readings are over 0.5 ohms, an electrician should be brought in to correct the problem.
The electrical requirements are for standard 208–240 volts, 50/60 Hz 15 Amp service. This unit is wired with #18 awg and
internally fused for no more than 3.15 Amps. When the unit is first powered on, there is a self-setting of the electronics for 50 Hz
or 60 Hz. At every power up, the electronics will take a couple of seconds to compare the pulses of the power to the pulses of the
crystal, which is built into the electronics. Then all time-related functions are correct no matter the power source.
The electrical requirements are for standard 208–240 volt split phase, 50/60 Hz 15 Amp service. When the unit is first powered
on, there is a self-setting of the electronics for 50 Hz or 60 Hz. At every power up, the electronics will take a couple of seconds to
compare the pulses of the power to the pulses of the crystal, which is built into the electronics. Then all time-related functions are
correct no matter the power source.
The standard supplied pumps are all 208–240 VAC, 60 cycle and are to be wired to terminals indicated on the appliance. In 50 cycle
applications, other pumps may need to be supplied, depending on water conditions.
Internal Wiring Connection
Failure to confirm proper grounding and the absence of stray voltage may result in premature component failure.
See start up and commissioning documents (Start Up Checklist) for details.
Terminal G (see Appendix) in the electrical compartment must be connected to the building ground system.
The incoming 208–240 volt single phase power supply is connected to terminals L1, L2 and N (see Appendix).
It is important that the electrical power is not turned on at this time. Double check all connections and then turn the power on. The
display that is provided with the ABH should now be reading the Setpoint temperature.
NOTE: See Start-Up Procedures Section Page 36 to change the temperature setting or run the appliance.
CAUTION! The incoming power shall be connected directly to the labeled, intended
connection points only. Failure to do so may result in an electrical short and the control
board will have to be replaced!
DANGER! It is extremely important that this unit be properly grounded! It is very important
that the building ground is inspected by a qualified electrician prior to making this
connection!